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Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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AAA-DDD complejos de triple enlace de hidrógeno complejos de triple enlace de hidrógeno.

Barry A Blight1, Amaya Camara-Campos, Smilja Djurdjevic

  • 1School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, United Kingdom.

Journal of the American Chemical Society
|September 15, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores lograron el sistema de triple enlace de hidrógeno más fuerte hasta la fecha con un complejo catiónico AAA-DDD. Este complejo exhibe una constante de asociación excepcionalmente alta, mostrando el poder de este arreglo específico de enlace de hidrógeno.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Física Química Física Química es la física de la química.
  • Química orgánica es la química orgánica.

Sus antecedentes:

  • El patrón AAA-DDD representa la disposición óptima para tres centros de enlace de hidrógeno contiguos, maximizando la asociación entre las especies moleculares.
  • Estudios anteriores establecieron límites más bajos para los sistemas AAA-DDD neutros y catiónicos, lo que indica fortalezas de unión significativas.

Objetivo del estudio:

  • Para sintetizar y cuantificar con precisión la constante de asociación de un nuevo sistema catiónico AAA-DDD.
  • Investigar las características estructurales que contribuyen a la mayor fuerza de unión en este sistema.

Principales métodos:

  • Síntesis de un nuevo complejo catiónico AAA-DDD (6*10+).
  • Determinación de la constante de asociación (K(a)) utilizando (1) H espectroscopia de RMN.
  • Cristalografía de rayos X para dilucidar la disposición estructural de los enlaces de hidrógeno y las interacciones electrostáticas.

Principales resultados:

  • El complejo catiónico 6*10+ demostró una constante de asociación (K(a)) récord de 3 x 10(10) M(-1) en diclorometano a temperatura ambiente.
  • El análisis estructural de rayos X reveló una matriz plana de tres enlaces de hidrógeno primarios cortos y paralelos (distancias NH...N 1.95-2.15 Å).
  • Estos enlaces primarios de hidrógeno son reforzados por interacciones electrostáticas significativas entre los protones y los átomos adyacentes aceptores.

Conclusiones:

  • El arreglo AAA-DDD, particularmente en sistemas catiónicos, puede lograr fortalezas de unión sin precedentes.
  • La configuración estructural precisa, que incluye enlaces de hidrógeno cortos y paralelos y refuerzo electrostático, es crucial para maximizar la asociación molecular.